Lifting jack



Dec., 26,1922. 1,440,016.

L. T. KHVIMERLE ET AL.

LIFTNG JACK.

FILED SEPT. I3, T921. 2 SHEETS-SHEET i.

H/ n l v 'I INVENTORS amazed ZKimimerze aniel S. lfmmer BycM/lww.

ATTORNEYv Dec. 26, 1922. l 1,440,016. L. T. KINIMERLE ET AL.

LIFTING JACK.

H1511 SEPT. 13. 1921. 2 SHEETS-sum 2.

INVENTORS Larrzed @Kimmerle Daniel mmemle BVC.. '1

ATTORNEY i CIR Patented bien.. 2n; lQRu mieli Metil@ rien Lennep nrrrnnnnnn enr DANIEL s. -nrivinrnninn or snit renner-sco, CALIFORNIA.

LIFTING JACK.

Application filed September To all whom t may concern.'

Be it known that We, Linnen T. Kirr- 'irnnLn and DANIEL o. limjivrnnnn,citizens ot the YUnited Statesyresidinginthe city and county oi" @an F'ancisco and `State oit California, have invented new and usetulimprovements in Lifting Jacks, oi which the following is aspeciiication.

This invention relates to lifting jacks, and especially to jacks oit thepaivland rack actuated type.

@ne of the objects of the present invenf tion is to generally improveand simplify lifting jacks oi the character described, and especially teprovide a substantial heavy duty jack adapted for wrecking` Work and thelike.` r y Another object of the invention is to provide a jack soconstructed and designed that it may be vreadily placed in position toengage or litt a load even though the` clearance between the load andits support be comparatively small.

Another object oitl the invention is to `provide an actuating; lever anda' novel arrangement oi reversible pavvls whereby the morernent oi thelever may be `transmitted to` either raise or lower the load.

Further objects will hereinalfter appear.

rlhe invention consists of the parts and the construction7 combinationand arrangienient ot parts as hereinafter more "tally de.-

scribed and claimed, having reference to the i accompanying drawings` inWhich- Fig. l is a side elevation in section ing the jack. i

Fig. 2 is a. detail side elevation showing; the position ofthe pawlsduring' thelowerino' oit a load. f y r Fig. is a detail. section on line3--2-1",

show- Fin'. 2. i i i Referring to the drawings in detaih` ,it indicatesa base member or plate ot suitable construction, and verticallyTdisposed and secured thereto is a bar 2, on onev face of which areformed rack teeth Slidabiy mounted on the bar is a shoe 4f, and guidingthe `shoe Withy relation to the bar is a pair of side extensionsl 5 andconnecting cross bar or section G. The side extensions are extendedSerial No. 500,413.

to iforrn journal members 7 for an operating vlever generally indicatedat B. Thislever `consists oi a handle section Q a socket 92* f and apair ot' iiorlshaped extending arms lll These arms being pivotallysupported bythe Iiournal members 7, as indicated at S the pivotalsupport being 'formed by pins ll extending through the bearings and thelever forli l0, and having iorrned on their ends shoes l2, which extendinto channel `shaped 0"rooves 13 formed in the respective sides or`thebar and serving the Afunction of urther'guiding the main shoe ewhereby r a load is engaged or lifted. Pivotally mounted ybetween thearms of the 'forli 10,

`as at lll, is a `pan/l l5 onthe lowerend oi which is `formed a dog 16which is adapt-ed to engage the teeth 3 Formed on the rear side oi" thepawl is a. lng,` 17, and .formed on the upper end thereof is a somewhatsimilar lug` 18. Pivotally mounted between the'arins ot` the i'orlr, asat 19, is a. bell crank shaped lever, one end ot which is exr recessedcam portion 23, and formed on the cross bar 6 is aguide .lug 24C withwhich the i `cam engages during the lowering ot a load as will later bedescribed. Pivotally 1nounted', as at `25,between ythe lower ends ot theside sections 5 is a pawl 2G. rlhe upper end oi this paivl terminmis` ina lun l `adapted to beengaged by a plunger QS This plunger is a compoundplungeryinasmuch as` it is hollow and carries a secondary plunger 29,which is normally held in projected position by means ot a spring 30.The lower end oi the pawl terminates in a dog 3l, adaptedto engage theteeth 3 on` the bar, and the dog is normally Aeid :in

`engagement with the teeth by means `oit a spring 32.

The operation ol the device will be as parted to the lever, it can beseen. that thel loa-d will be supported. by the pawl 15, as the dog 16thereon will engage one oi" the teeth oli the rack bar 3. ln other wordsthe lever will fulcrum on the pivotal point ot the pawl, and the shoe tand the load supported thereby will thus move upwardly in a verticaldirection. rihe lowerl pawl 31, which is supported by the shoe, willalso litt in unison therewith and the next tooth on the rack bar will beengaged. At this time extreme movement or' the lever 9 is reached and itis reversed by swingingit in anupward direc` tion. The load will duringthe upward movement be carried by the pawl 31 as the itulerun'i point orthe lever will now be changed from that indicated at. 14 to the innerend indicated at 8. ln other words the shoe l will remain stationary,while the lever is swinging about the itulcrum point 8, thus the pawl 15will he lifted to a point v where the dog 16 will engage the next toothon the raclr bar; the dog being automati- 4cally thrown into engagementwhen this tooth is reached, due to the pressure of the spring actuatedplunger 21. This cycle ofv operationis repeated until the load hasbeenlifted the desired distance. llllheii it is desired to lower theload, itis accomplished by merely reversing the position oiQ the lever 20, or inother words swinging it about its -tulcrum 19 to assume the positionshown in The plunger 21 will during this movement change itspositioinvthat is it will move out oic engagement with the lug 1T andinto ient with the lug 18, thus ein 1.-,verse pressure on the pawl A15 yich will tend toiree it with relation to theteeth o'f rack bar. rlhepressure on the pawl 31 has however not been changed and it willtherefore remain in engagement with the teeth of the rack har and thustemporarily support the load.` A. rocking;` movement may now he impartedto the lever 9 as previously described. rllhe rst downward movement otthe `rocking lever will take place when the pawl 15 has been releasedwith relation to the teeth ot the rack bar,

and the ulcruin point assumed will he that indicated at 8. J@is thelever swings aboutr its iiulcrum in a downward direction, the lower endol1 the pawl 15, or in other words the cam groove 23 formed in one sidethereoi will engage the guide lug 211. The pawl 15 or the dog` 16 formedthereon will thus be swung` inwardly as the lever swings down- 1,44o,oief wardly and it will be forced into engagement with the next tooth. itthe same time that the dogl 16 formed on the pawl 15 is being swungiiitoengagement with the lower tooth on the reel; bar7 a. foot extension40 on the reversing lever will engage the upper end of the plunger 29,that is engagement oi the loot with relation to the plunger is made amoment before the d og bottoms in the lower oit the raul; bar and theplunger 29 is therefore partially depressed when the dog bottoms in theteeth'. This partial depression ot the plunger 29 plaees the spring 30under increased pressure; the increased pressure produced beings'ulileient to overcome the tension olf the spring` However as theentire load is supported loy the pawl 31, it is obvious that theincreased tension on the sprin SO'is not suliieient to swing` the pawl31 out `olf engagement with this tooth until the pressure on the pawl isat least partially released. rThis release ot pressure takes place whenthe dog 16 engages the lower tooth and it changes the fulcruin of thelever from the point 8 to the point 11i, thus while the downwardmovement of lever 9 is still continued, or at a point .vhere itslowermost position is almost reached, a

elia-nge ol' lul/:rum takes place, thus imparting a slight upwardmovement to the shoe 'e andy the pawl carried thereby. T .is slightupward movement is suiiicient to release the pressure on the pawl, and'as the tension on the spring' has been increased, it can bev seen thatthe plunger 28 actuated thereby will exert suflieient pressure on theiipperend of the pawl to swing relation to the teeth onthe rack har.rlhe pawl thus released permits lowering` of the shoe el. and the loadcarried thereby as the lever may now be swung in an upward direotion,employing the'- point 11i as the fulcrum point. lhe momentupwardmovement is imparted to the lev r 9, downward movement will taireplace as tar as the shoe e@ concerned. The foot member fl() on the lever20 will also move away trom the plunger 29 and the pressure imparted tospring' 8O will be relieved, thus permitting spring 32 to again functionso as to swine` the lower end ot the pawl 31 into engagement with theteeth of the rack bar. lt will thus bein position to engage theneiittooth the shoe is moving.' downwardly and in fact engages andbottoms in the next tooth when the ei;- treme upward movement or lever 9is reached.

'lhe load is thus transferred from the pawl 15 free with nemer c beswung inwardly into engagementltvith the l nent tooth et the raclr bar.

load.y but the chance trom one nawl te another is automatically takencare of by the swinging` movement of the lever 9 and the position ot thereversing` lever 20.

l-he jaelr illustrated in the present instance is particularly designedfor heavy duty Work, such as handling wrecks and the like. ln manyinstances 1t is rather diltlcult to place the jack between a load andthe suprests as the clearance v port upon which it may be very small.Such ditliculty is avoided in the pr sent inst-ance as the shoe l may belowered into engagement 'with the base A, thus permitting` the shoe tobe placed under the load even though the clearance be exceedingly small.rllhe general construetion and design is furthermore `such that heavy,substantial parts may be employed, thus takingcare ot practically anydesired load. Another important feature is the fact that the operationsof the pavvls are entirely automatic, Whether raising or huivering,` theload as they are positively released and thrown into engagement by theaction ot the main operating' lever 9 and the reversing,` lever :20,thus avoiding all accidental delays and materially reducing the'responsibility and care required on the part of the operator.

While certain features et the present invent-ion are more or lessspeeilieally illustrated, We Wish it understood that various chang-es inform and proportion may be resorted to Within the scope of the appendedclaims, similarly that the materials and linish of the several parteemployed may be such as the experience and judgment oi" the manufacturermay dictate or varying uses may demand. i

Having thus described our invention, what We claim and desire to secureby Letters Patent isil. A lifting jack comprising a standard, having'rack bar teeth termed thereon, a lifting; shoe verticallj slidable onthe standard, a main lifting bar pivotally attached to the shoe, a paivlcarried by the lever and engareable with the teeth, a second paWlcarried by the shoe and also engageable with the teeth, and means forreversing` the action of the respective pavvls,`

A lifting ack comprising a standard, having rack bar teeth formedthereon, a littinoj shoe vertically slidable on the standard, a mainlifting bar pivotally attached to the f shoe, a pawl carried by thelever and enrageableivith `the teeth, Ia second payvl carried by theshoe and also engageable with the teeth, and means'carrieeL bytheli'lt-ing lever for reve the action the respective pavvls. y

3. n lifting .jack comprising` a standard having racl; bar teeth termedthereon7 a liftshoe vertically slidable on the standard, a main lifting`lever pivotally attached to the shoe, a paivl pivotally mounted on thelever and engageable with the teeth formed on the standard, a springactuated plunger engageable with the pawl and movable to engage oppositeends et the pavl to reverse the action thereof, a pavvl pivotallymounted on the shoe, andmeans operable in unison with the spring`actuated plunger or reversing the action or the last named pavfl. a. frlifting jacl; comprising-r` a base, a rack bar secured to the base, alifting shoe slidably mounted on the raclr bar, a main lifting,` leverpivotally mounted on the shoe, a pawl pivotally mounted in said leverand engjageable with the teeth or the bar, a reversing lever alsopivotally mounted on the main lifting lever, a spring actuated plungeron the reversing,` lever adapted to alternately engage opposite ends ofthe pavvl, a second pavvl pivotally mounted on the shoe and engageablewith the teeth on the raclr bar, a springactuated plunger engageablewith one end of said pawl, and means on the reversing lever for engagingsaid spring actuated plunger.

5. if-'l lifting jack comprising a base, a raclr bar secured to "thebase, a lifting shoe slidably mounted on the rack bar, a main lifting;lever pivotally mounted on the shoe, a pavvl` pivetally mounted in saidlever and engageable with the teeth ott the bar, a reversing' lever alsopivotally mounted on the main lifting lever, a spring actuated plungeron the reversing` lever adapted to alternately engage opposite ends or'the paivl, a second parvl pivotally mounted on the shoe anu engageablewith the teeth on the rack bar, spring an@ .ated plunger engageablevvithone end ot said paul, means on the reversing leverlior engagingsaid spring actuated plunger, "a stop member on the shoe adapted tolimit the movement of the first named paivl in one direction, and a cammember termed on said paivl engageable with the stop and adapted toswing the pavvl .inwardly 'into engagement With the rack bar teeth whenthermain litting;v lever is loW- ered during' reveil-sing;- actionu 6. Alifting; jack comprising` a standard having' teeth termed thereon, alifting shoe slidably mounted on the standard, a lifting lever pivotallymounted on the shoe, a paw] pivotally mounted in said lever andengageable with the teeth of the standard, a reversing lever pivotallymounted on the lifting lever, means carried by the reversing lever ptedto alternately engee opposite ends he paw, a second pawl pvotaly mounted0:11 the shoe and ellgjagjeable with the teeth en the Standad, spyingmeans fol" normally urging one end of' said pawl into engagement withthe teeth on the standmd, a spring actuae phmgerf engagieable with theother end of said pewl and Leens on Ehe reversing lever Eier engagingsaid ectuaed plunger cause the revelsng of the pewl, said means being'opemble only when the pressuf-e 01D the paw has. been released.

LARNED T, KIMBLERLE. DANEL KMMERLE.

